Abstract This paper analyzed the characteristic of business flow and divided the business flow into two categories according to the flow distribution: elephant flow and mice flow, combined with the characteristics of the elephant flow’s high delay tolerance and bandwidth demand flexibility, focused on the multi-layer traffic coordination problem in the optical transport network, and the lack of fairness guarantee and multi-path transmission mechanism in the competition of bandwidth resources between elephant flows, realized the coordination of service traffic between the IP layer and the optical layer, proposed a periodic resource scheduling mechanism and a cross-layer global routing and bandwidth scheduling algorithm based on fairness and multi-path transmission under the unified control “IP over OTN” transport network architecture based on the SDN architecture and the OpenFlow protocol.
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